Universiteit Leiden

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Face masks and lab work - update corona measures Faculty of Science

15 October 2020

The national measures to reduce COVID-19 have been tightened considerably. New measures apply throughout the Netherlands. What does this mean for teaching and research at our faculty? 


  • All teaching at our faculty buildings will proceed as scheduled. 
  • Always do the Corona check before coming to teach at the faculty. 
  • Face masks are mandatory in all university buildings when walking around. You are responsible for bringing your own face mask. As a teacher it is not mandatory to wear a mouth shield when teaching. If you want to wear a face mask during the lesson you are free to do so. Students wear their face masks when entering and leaving the classroom and are allowed to take off their face masks when they are seated.  
  • Within the Faculty of Science, there is an exception for the chemical and biochemical labs and practicalrooms; see Laboratories and practical rooms.  
  • The measure concerning a maximum number of 30 people in a room does not apply to education. All lecture halls and workgroup rooms indicate the maximum number of students allowed on the door. 
  • For the time being, we are assuming that the rules for higher education for the second semester will not change substantially compared to today. It is therefore likely that the new semester will also consist of a mix of online and offline education. The national guidelines will continue to prevail. 

Laboratories and practical rooms 

  • As of 15 October 7.00 hrs, Leiden University makes it compulsory for everyone who is in our buildings to wear a face mask. The only exceptions are the chemical and bio-chemical research laboratories and the chemical and bio-chemical practical rooms within our faculty. We advise not to wear fase masks in these labs. The ventilation in these labs is so strong that it provides good protection. Wearing a non-medical face mask even leads to higher risks. Practitioners wear a face shield. Tips for supervising students in the lab can be found on the employee website. Outside the labs and practical rooms, a face mask is mandatory.  


  • Work from home unless you need to be in the faculty to teach or for research. 
  • safe and healthy workplace at home is very important. Do you need extra support? Report this to your manager. 
  • Take enough rest and a moment of relaxation while working from home. Tip: take part in Healthy University Week and make exercise part of your working day. 
  • Requests to come and work at the faculty should be discussed with your manager. 
  • Always complete the Corona Check before coming to work. 
  • If you have any concerns, contact your manager.  

If you still have questions about the measures, check the website for all the latest information. 


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